check for block devices only on non-win32 systems
check for block devices only on non-win32 systems

https://bugzilla.gnome.org/show_bug.cgi?id=575373

MathieuDuponchelle/totem-pl-parser,pwithnall/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,MathieuDuponchelle/totem-pl-parser,pwithnall/totem-pl-parser,MathieuDuponchelle/totem-pl-parser